Separator for grinding-mills.



W. J. PRICE.

SEPARATOR FOR GRINDING MILLS. APPLICATION FILED MAYH, 191s.

Patented Apr. 24, 1917.

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WILLIAM 3'. PRICE, OF DIXON, ILLINOIS.

S EPARATOR FOR GRINDING-MILLS.

Specification of Letters Patent.

Patented Apr. 24, 1917.

Application filed May 11, 1916. Serial No. 96,887.

To all whom it may concern:

Be it known that 1, WILLIAM J. PRICE, a subject of the King of GreatBritain, re siding at Dixon, in the county of Lee and State of Illinois,have invented certain new and useful Improvements in Separators forGrinding-Mills; andl do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

My invention is a pneumatic'separator for use in connection withgrinding mills of the ring roll type or analogous mills, the objectthereof being to provide an improved separator whereby the fine andcoarse particles in the product discharged from the grinding mill areseparated in a dustless and expeditious manner.

With this general object in view, the invention resides in certain novelfeatures of construction and in unique combinations of parts to behereinafter fully described and claimed, the descriptive matter beingsupplemented by the accompanying drawings which constitute a part ofthis application and in which:

Figure 1 is a side elevation of the invention showing its application;

Fig. 2 is an enlarged Vertical section; and

Fig. 3 is a horizontal section taken on the plane indicated by the line3-3 of Fig. 2.

In specifically describing the construction shown in the drawings abovebriefly described, similar characters will be placed on correspondingparts throughout the several views and reference will be herein made tothe numerous elements by their respective indices. To this end, thenumeral 1 designates the improved separator into which the dischargechute 2 of a grinding mill 3 delivers, said separator having at itslower end a coarse material outlet 4: from which a suitable conveyer(not shown) usually returns to the inlet of the mill 3. The upper end ofthe device'l is equipped with a fine material discharge pipe 5 whichenters the eye of a fan casing 6, the fan in said casing deliveringcentrifugally into the usual whirling type of dust collector 7 whichcollector discharges the fine material deposited therein through anoutlet 8 at its lower end. From this outlet the material may be conveyedin any suitable manner. Leading from the upper end of the collector 7and extending a suitable dismotion of the air as it leaves the collector7 and enters the pipe 9, the inlet end of this pipe is preferablyprovided with a vertical baffle plate 10, and in order that excessivepressure may be relieved from pipe 9, a valved vent 11 is provided.

The foregoing will give a general understanding of the manner in whichthe inven tion is applied while the following description andexplanatory matter will make clear the numerous novel features ofconstruction and the uses and advantages thereof.

The casing of the separator 1 is formed of upper and lower cylindricalsections 12 and 13 having open inner ends spaced apart by sleeves or thelike 1 1 interposed between angle iron reinforcing bands 15 which areriveted or otherwise secured to said inner ends, bolts 16 being passedthrough the hori- Zontal flanges of said bands and through the sleeves14L as shown clearly in Fig. 2. The upper end of the section 12 isprovided with a frusto-cone-shaped top 17 into whose upper end the pipe5 projects a suitable distance, the bottom 18 of the section 18 beingpreferably in somewhat the form of the top 17 but being inverted toallow the coarse material therefrom to be readily directed to the outlet4.

Mounted within the lower section 13 of the casing is means for retardingthe clownward movement of the product discharged from the mill 3,said'means being preferably though not necessarily in the form of a cone19 onto whose apex the chute 2 delivers, the base of said cone beingspaced from the side wall of said casing 13 and being held in place byappropriate brackets 20. It will be noted by reference to Fig. 2 thatthe upper end of the cone 19 is disposed above the space between theinner ends of the sections 12 and 18,.this being essential since saidspace constitutes an inlet for directing a horizontal film of air underpressure against said cone for the purpose of blowing the finerparticles of material thereon upwardly toward the fine material outlet5.

The film of air above referred to is supplied from the pipe 9, whichpipe delivers into an annular conduit 21, the latter surrounding andbeing secured to the adjacent ends of the upper and low er casingsections 12 and 18. For varying the strength or" the current of airwhich forms the film, a metal sleeve 22 is mounted slidably within theupper casing section 12, said sleeve engaging the wall of said sectionand being adapted to depend various amounts below said wall. The sleeve22 may be adjusted by raising and lowering operating arms 28 which risetherefrom through openings in the top 1'7,

said arms being shown in the present embodiment of the invention as heldnormally against movement by spring catches 2 1. It will be understood,however, that any suitable means may be used for holding the sleeve 22in its numerous adjusted positions.

A funnelshaped deflector plate 25 is shown beneath the lower end of thefine material discharge pipe 5, said deflector plate being movabletoward and away from said pipe through the instrumentality of arms 26similar to the arms 23 and equipped with suitable fastenin means 27. Theplate 25 is of greater diameter than the pipe 5 and thus serves toretard the passage of fine particles of grain or the like into saidpipe. Thus, it decreases the strength of the upward currents 01 air atthis point with the result that any comparatively heavy particles ofmaterial which may have been carried upwardly by said air currents willfall into said plate 25, the latter having a discharge opening 28 in itslower end by means of which said heavy particles may descend onto theapex of the cone 19 to again be acted on by the film of air.

In operation, the fan within the casing 6 is set in motion with theresult that upward currents of air will be drawn from the separator,while a film of air of predetermined power will be forced into saidseparator through the space between the upper and lower casing sections12 and 13. As the mill 3 is now operated it discharges the product to beseparated onto the apex of the cone 19 and this material starts to falltoward the bottom of the separator. In so doing, however, it encountersthe film of air with the result that the coarser particles will fallfrom this film while the finer material will be blown toward the upperend of the device, at which point it will be caught by the upwardcurrents of air set up by the fan in the casing 6. Thus it will be drawninto said casing anddelivered therefrom into the dust collector 7 fromwhich it will be discharged through the outlet 8. During this separatingoperation, any comparatively heavy particles of grain or the like whichmay have been directed to the upper end of the casing will be caught inthe deflect r 25 and returned'to the cone 19.

When operating on difierent grades of material or when it is desired toseparate the j product into difierent grades of fineness, the

necessary results may be obtained by proper adjustment of the sleeve 22and deflector plate 25, which devices control the Velocity of the aircurrents as will be readily understood. Furt-hermore, the fan in thecasing 6 may be rotated at dilferent speeds as occasion may demand.

From the foregoing, taken in connection with the accompanying drawings,the construction, manner of operation and advantages of the improvedmachine will be readily understood without requiring a more extendedexplanation. In conclusion, however, I will state that althoughoertainspecific details have been shown and described for accomplishingprobably the best results, numerous changes may be made-within the scopeof the invention as claimed without sacrificing the main advantagesthereof.

I claim:

1. In a separator for grinding mills, the combination of a separatingchamber having in its lower end a coarse material outlet and in itsupper end a fine material outlet through which suction is to be created,

means for depositing ground material in the chamber, means for retardingthe downward travel of such material in said chamber, means fordirecting a horizontal film of air against said retarding means, andmeans for preventing the discharge of coarse particles with the finematerial and for returning them to the retarding means.

2. In a separator for grinding mills, the combination of a separatingchamber having in its lower end a coarse material outlet and in itsupper end a fine material outlet through which suction is to be-created,means for depositing groundmaterial in the chamber, means for retardingthe downward travel of such material in said chamber, means fordirecting a current of air against said retarding means, and means forretarding the passage of material from the separating chamber into thefine material outlet,

and for collecting coarse particles-of suchmaterial and returning themto the first mentioned retarding means.

3. In a separator for grinding mills, the combination of a separatingchamber having in its lower end a coarse material outlet and in itsupper end a fine material outlet through which suction is to be created,means for depositing ground material in the chamber, means for retardingthe downward travel of such material in said chamber, means fordlrecting a current of air onto said retarding means, and afunnel-shaped deflector plate disposed beneath the fine materialoutletand' having a central discharge opening, said deflector plateserving to collect comparatively heavy particles of material and to return them through said discharge openingto said retarding means.

4. In a separator for grinding mills, the

combination of a separating chamber having in its lower end a coarsematerial outlet and in its upper end a fine material outlet throughwhich suction is to be created, means for depositing ground material inthe chamber, means for retarding the downward passage of such materialin said chamber, means for directing a current of air against saidretarding means, a funnel-shaped deflector plate disposed beneaththefine material outlet, said plate having a central discharge openingthrough which heavier particles of material collected on said plate maybe discharged, and means permitting vertical adjustment of saiddeflector plate.

A separator for use in connection with grinding mills, said separatorcomprising a casing having pneumatic separating means therein, the lowerend of said casing having a coarse material outlet while a fine materialdischarge pipe extends from the upper end of said casing, a funnelshaped deflector plate disposed beneath and of greater diameter thansaid pipe, said plate having a central opening to dischargecomparatively large particles of material collected therein,

and means permitting vertical adjustment of said deflector plate.

6. A separator for grinding mills com-- prising a separating chamberhaving in its lower end a coarse material outlet and in its upper end afine material outlet, means for depositing ground material in theseparating chamber, means for retarding the downward travel of saidground material, means for directing a film of air from the wall of theseparating chamber against said retarding means, means for preventingthe discharge of coarse material with the fine and for returning it tothe retarding means, said preventing means being adjustable fordifferent grades of material, and means for varying the size of theinlet of the air film according to the grade of material beingseparated.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

EMMA K. BARTHoLoMEW, GERTRUDE G. YOUNGMAN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

